Thread-using machine



Aug. 9,1927. 1,638,210

C. M. PERKINS THREAD US ING MACHINE Filed May 22, 1922 4 Sheets-Sheet 1A z3 Z2 Z7 0 y l! l 16 J 7 7 i 14.1.9

nn I IllIl-Illll Aug. 9,1927. 1,638,210

C. M. PERKINS THREAD USING MACHINE Filed May 22, 1922 4 Sht-ebS---SheellL-; ,if v

Allg. 99 C. M. PERKINS THREAD US I NG MACHI NE Filed May 22, 1922 4Sheets-Sheet 3 CZcz/Zesf @riz/176,

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' 1,638,210 Allg- 9 1927' c. M. PERKINS THREAD USING MACHINE Filed Mag22, 1922 4 Sheets-Sheet 4 c .ZZ

Patented Aug. 9, 1927.

UNTE STATES CHARLES M. PERKINS, OF COI-ICES, NEVI YORK.

THREAD-USING MACHINE.

Application led May 22,

This invention relates particularly to an automatic knot and slugdetecting and stop motion device for multiple thread machines, whereinprovision is made for the automatic operation of stop mechanism for themachine through the presence of a knot or other imperfection in anythread or threads drawn from the spools.

The invention is particularly designed for application to a machine setand maintained in motion througl the manual operation and holding of anappropriate treadle or the like, the presence of a knot or similarimperfection in the thread or threads being used, automaticallyactuating means to disconnect the treadlo from operative control of themecl'ianism, and therebyy permit such mecha'- nism to act as a stopmotion.

An important object of the present invention is the provision of threadguides, through which the thread passes, and Which are adapted to beactuated by the presence of a knot or other imperfection in the thread.These guides are constructed so that one at least is somewhat moresensitive and quickly responsive to thread imperfection than the others,whereby provision is made for taking care of threads having sensitivetension adjustments, as are necessary in some stitching operations.

fi. further object of the invention is the provision of a releasemechanism involving a trip mechanism, the release mechanism providedwith normally set for the manual control of ordinary sewing machine stopmechanism, the release mechanism including a trip, which when operated,causes the release mechanism to interrupt the manual control of the stopmechanism, and thereby release the stop mechanism for effectiveoperation. The trip mechanism, Which is arranged intermediate the threadguides and trip of the release mechanism, is automatically set in motionby the movement of the thread guide due to a thread imperfection, tooperate the. trip and set the release mechanism in operation.

'he trip mechanism is Within control of the manual means through WhichVthe machine is normally' governed, so that following an automaticaction of the trip mechanism, through a thread imperfection, themanually operable means will restore and automatically set the tripmechanism for succeeding automatic control.

in important detail of the present inven- 1922. Serial No. 562,799.

tion is the arraagementl of the trip mechanism, which the threaddirectly governs for the operation of thc release mechanism, so thatfollowing automatic action of such trip mechanism, the thread guide isfree to continue its movement in the direction of the thread movement,and formed so that in such continued movement, the thread andobstruction thereon is permit-ted to freely pass the thread guide,thus'the thread and obstruction will pass by the thread guide withoutundue tension on the thread, and there is little liability of threadbreakage or disturbance of adjustments resultant from undue tension onthe thread.

ri`he release mechanism is adapted to be actuated by the power tableshaft, which dr'vcs the machine to be stopped, and is thereby instantlyresponsive to the control resultant from a tread imperfection passingthrough the thread guide, the parts, following the release movement,tending to resume a normal position in so far as permitted by cocperatngparts, to thereby provide for resetting the machine merely through theoperation of the foot treadle or the like.y

ln the drawings:

Fig. l is a view in elevation partly in section, illustrating theimprovement with the parts shown in connected relation, and the stopmotion indica-ted in release and stop positions in full and dottedlinesre- Fig. 6 is a section on line 6-6 of Fig. 5.

Fig'. 7 is a View similar to Fig. 6. the thread uide being shown inposition resultant from a. knot in the thread, and the catch of the tripmechansm being shown released.

Fig. 8 is a section on line 8-8 of Fig. 5.

Fig. 9 is a Section on line 9-9 of Fig. 5.

Fig. 10 is a perspective detail showing the means for actuating thethread guides of the plural arrangement through the release of the tripmechanism following the operation of the sensitive thread guide.

Fig. il .is a view in elevation partly in lill section, illustrating thesto'p motion release means and the connection between the same and thetrip mechanism, the parts being in normal positions.

Fig. 12 is a similar view with the parts in operative positions, and theconnection to the stop motion in release posi-tion.

Fig. 13 is a perspective view showing the arrangement of the barsconnected to the stop motion and to the treadle, the interlocking barbeing shown in position to release the stop motion bar.

Fig. 14 is a horizontal sectional view illustrating the releasemechanism and the connection between thc Same land the stop inotion.

Fig. 15 is a broken View in elevation for the trip resetting means, theresetting pawl being shown in initial resetting position in dottedlines.

Fig. 16 is a similar View. the resetting pawl being shown in positionassumed immediately fol'lowing the resetting operation.

Fig. 17 is a perspective View illustrating the resetting pawl and guidetherefor in relation to t-he resetting member of the trip mechanism.

Fig. 18 is a perspective View of one wall of the guide for the resettingpaWl.

Fig. 19 is a perspective view of the resetting pawl and the connectionbetween the same and the operating treadle.

The present invention involves the specitic construction and thecombi-native relation of several distinctive instrumentalities, whichwill be hereinafter described in the order named, and which may bebriefly referred to as thread guides, through Which the threads pass,and which are operated by any knot or imperfection in any of thethreads; a trip mechanism released in the operation of the thread guidesfor a free operative and preferably gravital movement; a releasemechanisni which is brought into operation by and following theoperative movement of the trip mechanism and a stop motion of approvedor conventional design, Which is automatically set in motion -to stopthe machine through actuation of the release mechanism. The threadguides and trip mechanism are supported `above the bed plate of themachine; and comprise a Standard 1 rising from said bed plate, to whichis secured at the upper end a hollow rectangular frame 2. Ears 3 dependfrom the respective ends of the frame and rotatably support a trip shaft4. Collars 5 and 6 are secured in spaced relation upon the shaft 4, fromeach of which extend tubular projections 7, adapted to adjustablyreceive, through set screws 8, rods 9. A plate 10 is carried by theupper ends of the rods 9, the upper edge of the plate being formed withV-shaped notches 11.

An inverted U-shaped strip 12 is frictionally engaged over the upperedge of plate 10, said strip 12 being formed in the lower edges withV-notches 13, cooperating with the notches 11, to thereby form threadopenings, through which the thread passes. Plates 1() and 12 are hereshown as formed with vtour thread openings, these plates constituting athread guide fr the reception of a plurality of threads, it beingunderstood of course that any number of thread openines may be formedtherein. An additional independent thread guide, designed particnlarlj,vfor more sensitive operation than the thread guides previouslydescribed, is also mounted on the shaft 4, and comprises a sleeve l-rfreely rotatable on the shaft, from wheli extends a. tubular projection15 adjustably receiving a rod 1G formed at the` upper endy withdivergent lingers 17, which at their juncture is formed with a slot 18,the width ofv thread diameter. The sleeve 14 is of reduced diameter atone end as at 19, and this reduced portion is formed in part of a squareor plain face 20, to receive the upper laterally projected end 21 of alatch 22.

is secured in one of the ears 3 and cifilcd about and connected to theshaft fl. this spring serving to normally hold the respective threadguides in the upright or operative positions. one or' the tubularprojections 7 and exten-ds to and in rear of the projection 15, wherebywlien the thread guides in the plates 10 and 1L. are operated by a knotor other imperfection in the thread, the thread guides 17 will also beoperated by the rod 24, though the thread guides 17 may be independentlyoperated by lthe thread passing therethrough, as `will be apparent fromthe drawings and description. This construction permits the use of thedevice in a mu ti-thread machine, of which one particular thread is ofsuch a nature, as by material or required tension, that .the meansresultant from the attempt of an 1mperfection in that thread to pass,must be extremely sensitive. The independent thread guide is thus moresensitive than the remaining thread guides.

lfhe trip mechanism is controlled by the atch 22 and comprises a rod 25slidably mounted in guides 2b, projecting from the standard 1, the upperend of the rod having a block 2'? removably secured thereon by a setscrew 28, to which block the latch ren'iovably secured at 25). A weight30 is adjustably secured upon rod 25 by a set screw 31. this weightcausing the red 25 to move downwardly when the latch 22 is released, theadjustment of the weight providing for limiting this downward movementof the rod to the desired extent through cooperation of said weight inone of the guides 2'3. The lower end of the rod is provided with a blockadjustably secured thereon, and formed with outstanding lug 33, throughwhich il;

A spr A rod 24 is secured to 1' threaded a screw 34. The end of thescrew is adapted to engage one end of a lever pivotally supported on alug 36, rising from the bed plate, the opposite end of the lever havinga loose connection Wit-h a pull rod 37. rThe pull rod is adapted tooperate the trip lever of the release mechanism to be later described,and the extent of this operation can be readily controlled throughadjustment of the screw 34. The block 27 on the upper end of the rod 25is provided With an upwardly extending member 38 slotted at 39 toreceive a pin 4() projecting from a collar 4l, Secured upon shaft 4.

The release mechanism proper is mounted upon a frame tixed to the underside of the bed plate ot' the machine, and comprises a plate 43 with adepending Web 44. A shaft 45 is supported in suitable bearing bossesprojecting from the web 44, and is provided at one end with a pulley 4Gadapted to be connected by belt 47 operatedy from a suitable pulley 48on the povvcr table shaft. 'lhe opposite end of the shaft 45 is providedwith a. serrated or toothed disc 49, which disc from its connection withthe shaft, is also continuously operated. Pivotally supported in the web44 above the shaft 45 is the inner end of a release lever 50, the outeror free end of which pivotally supports at 5l a pawl 52, the toothformed end 53 of which is in line with the toothed edge ot' the disc 49.The pawl 52 ha.; an arm extension 54 projecting toward the pivot of thelever 50, this arm extension 54 being connected to the pull rod 37. Thepawl 52 is supported upon a stud, which stud has an extension. The endof the stud beyond the pawl is Slotted and a spring is coiled about thestud with one end seated in the slot, the opposite end engaging behindthe projection. Thus, the spring may be adjusted by turning the stud, aset screw holding the stud in adjusted position. A stop 55 is arrangedto limit the dista-nce 2 of the toothed end 53 of the pawl 52 from thedisc 49. By turning the head 57, the limit positionot' the lever isobviously adjustable. The inner or pivotally connectedi end of the leverhas a depending project-ioni 58, which through the medium of a link 59jis connected to an interlocking bar 60. which! extends through asuitable guide opening in| a bracket 6l, secured to or forming part of lthe release mechanism fra-me. This bracket 6l slidabljv supports a bar62, which is di-i rectly connected, as through a rod 63, with al treadleor other manual pressure means (not: shown). A similar bar 64 isslidably mount-l ed in the bracket Gl and this bar 64 is, through themedium of a rod link 65, con-l nected to the end of arm of a clutchlever of the stop motion to be later referred to.

The pan/'l 52 is tensioned to insure its proper movement by spring 55,While spring 55 acts to normally maintain proper relation between thepawl and lever 50 when the parts are Ain inoperative positions.

In the normal positions or' the parts, the free end of the release levcr50 is resting upon the adjust-able stop 57, and the interlocking bar 6()is in normal or operative position. In this position, the Said barextends through an opening 66 in the treadle connected bar G2, and alsoior an appropriate length into an opening 67 in the clutch leveroperating-bar 64. Thus with the interlocking bar (30 in normal position,the bars 62 and 64 are actuated as a unit in the depression ot' thetreadle or similar member, but on the Withdrawal of the interlocking barfrom its connection With the clutch lever operating bar 64, the latteris free to move for a purpose to be hereinafter referred to.

The interlocking bar 60, which is the bar which controls theinterlocking cooperation between the bars 62 and 64, permits manualoperation of the bar 62, after the bar 64 is t'rz'ed. This manualoperation of the bar 62, which so long as the bars 62 and 64 areconnected by the interlocking bar 60, serves to start and stop themachine. at the will ol the operator, is utilized following an automaticaction of the stop motion, duc to thread imperfection, to reset theparts, and particulz-irly the thread guides and trip mechanismdescribed.

For this resetting of the thread guides and trip mechanism, the bar 62is connected to a rod 68, which extends through the bed plate of themachine, and is provided with an enlarged end 69, in Which is pivotallysupported a pawl 70, a spring 7l being coiled about thel enlarged end 69and engaging the pawl to hold the same in Substantial alignment With therod. A paWl guide 72 is mounted on the bed plate to one side of the pawl.and has an offset bend 73 therein, so that the upper portion of theguide is vertically offset from the lower portion. The guide includes aplate 74 secured at its upper end to the guide proper and depending fromsuch upper end in spaced relation to the guide proper to provide achannel 75 to slidably receive pin 76 projecting from the paWl 70. The`'plate 74 is formed With an opening 77 at the upper limit of movementot' the pawl, lof a size to permit the pin to pass theref jthrough, thelower end of the plate ter minating above the odset 73 ot' the guideproper, so as to permit the pin, when riding Aon the offset, to beguided thereby outwardly beyond the plate 74. The block 32 .on the sidenext the pawl 70, is formed near its upper end with a` projection'78having an undercut bottom Wall 79, and the upper end of the paWl isinclined at 8O to correspond With the undercut projection. It 'may behere stated that in the normal conill) Il U

trol by the operator of the starting and stopping of the machine, thelowest limit of movement of the pin 76 is above the offset 73, so thatthe pin merely reciprocates in the space between the guide proper andplate 74, but that following automatic operation of the stop motion, thepawl is moved to a lower position, se that the pin 76 is guided ont bythe offset 73, thereby positioning the end of the pawl beneath andinterlocking' the same with the under-cut projection 78 of the block Onthe upwart. movement of the treadle, the pawl operates to lift thelilock and restore the trip mechanism, whereupon the spring 71 restoresthe pawl to its normal substantially vertical position, direngaging thepawl from the block 32. llhen the pawl raises the mechan`sm and thelatch 22 properly cooperates with the plain face 2U and maintains thiscooperation, the pawl will leave the undercut 78 and through the actionof spring 7l return to normal positon, the pin 76 riding through theopel "7 If however,

l. due to a too sensitive atiustment or a in the operation, the latch 22does not properly engage the surface 20, the undercut projection 78 willhold the pawl 70 against the action of the spring 71, and es the treadlef' moves downward, the trip mechanism will follow and thus automaticallytrip the stop mechanism before the clutch has been engaged. Thus untilthe operation is such that the latch 22 is properly in position, nostartingl operation is had. In order that the operation of the mechanismdescribed may be better understood, it is deemed advisable to describe aconventional and well known type of stop motion. rThis stop motionincludes a shaft 8l held against movement in brackets 82 secured to anddepending from the bed plate. On this shaft is loosely mounted a clutchmember including a clutch face S3, a brake disk 84, secured to suchclutch face, a pulley 85, from which a belt- 86 extends to operate theparticular sewing machine with which the improved mechanism isassociated, and a thrust collar 87.

A cooperating clutch member is also mounted on the shaft 81, including aclutch section 88 to cooperate with the clutch face 83, and a connectedbelt wheel 89 to be operated from the line shaft, which shaft may beconnnon to a number of machines. A lever 90 is pivotally supported on abracket 91, depending from the bed plate and is provided with an arm 92,carrying a brake member 93 to cooperate with the brake ldisk 84, Aathrust arm 94 bifurcated to straddle shaft 8l and cooperate with thrustcollar 87, and an arm 95 projecting oppositely from arm 92 with respectto the pivot. The arm 95 is connected to the bar 64 through the rod link65 previously referred to. A spring 96 connects the lever 9() with thebed plate, said spring normally influencing the lever for movement inthe direction to apply the brake 93 and release the pressure of thethrust arm 94 on the thrustcollar 87 and thereby permit disengagement ofthe clutch members 83-88.

Assuming the parts to be constructed and arranged as described, it isapparent that a knot or other imperiection in the thread passing throughany of the thread guides will move said guides in the direction oftravel of the thread. If the imperfection exists in the sensitive threadguide 17, this guide ill be turned on the shaft 4 a center until theplain. portion 2O of the sleeve eat-ension 19 will ride from beneath thelatch 22. This permits rod 25 to move downwardly under the influence ofweight 30 and all of its contained parts and exert an upward pull on theconnector 37, through lever 35. The downward movement of the rod 25through member 38 and pin 40, turns the shaft 4 againstl the tension ofthe spring 23, thus turning the thread guides in plate l0. l f however,the thread having the imperfection is one passing through the threadguides in the plate l0, said guides will be tilted by the thread, andarm 24 will cause a corresponding movement of the thread guide 17,

thereby releasing the latch 22 with the result described. As connection37 is drawn upwardly, the pawl 52 is operated to cause the tooth end 53thereof to engage one of the teeth of the dise 49. As this disc iscontinuously operated from the power shaft, the connection of the pawlthereto raises the free end of lever 50 until the arm 54 of pawl 52engages the stop 97, whereupon the pawl is forced from engagement withthe tooth disc. This movement of the lever 50 will, through the link 59,draw the interlocking bar 60 from the bar 64, whereupon the spring 96immediately acts to free the clutch 83-88 and apply the brake 93. Thissto-ps the movement of band pulley 85 and so stops the articular'machine.

As the bar 64- is thus moved by the spring 9G, the opening 67 therein isout of alignment with the interlocking bar 60, and hence the spring 55,which tends to restore the lever 50 to normal position, cannot fullyreturn said lever. The operator regains control of the machine andsimultaneously resets the trip mechanism and thread guides, by movingthe operating treadle first downwardly to cause the pawl 70 to loci;beneath the offset 7 8 of the block 32, which block is now of course inlowered position, then moves the treadle upwardly, thereby moving therod 25 to a position to cause the latch 22 to again engage ,the plainportion 2O of the sleeve member of the sensitive thread guide, and atthe same time moving the bar G2, and connected interlocking bar 60upwardly, until said interlocking bar aligns with the all) llO

lil() opening 67 in the har 64. The spring 55 then tends, through thelever 50, to move the interlocking bar (5t) to engage the open infr (i7in the bar di. The bars G2 and 64 are again connected, whereupon theoperator, by the continued moven'ient or' the pedal in the downwarddirectit'in, operates the lever tl() to release the breite l cause theclutch members SIL-'o8 to be engaged through pressure ot' the thrust armon collar Si. The machine is thus started. and within complete controlot' the operator for stopping and starting at. will.

lt is to be particularly noted that when a thread guide has beenoperated and the latch released, the thread guide shaft seeks to returnto normal position under the influence ot' the spring 23. This. springhowever, is insuiticient to hold the thread guides in normal positionagainst the continued pull otl a thread, and hence following theautomatic trip through a hnot or other imperteetion in the thread, saidguides will tilt to a position to permit the thread hnot or otherimperfection to pass through the guide without a material interruptionot the thread movement. yThis is impm'tant as thereby there is little orno interruption to the normal travel oi the thread, and hence' there hasbeen no undue tension placed upon the thread for the actuation olf thereleased mechanism. The thread guide movement is naturally a sensitiveone, and the engagement. of the latch .22 is also so delicately balancedthat the presence of a knot or other imperfection will cause the.necessary release of the trip mechanism entirely without stopping thetravel of the thread. The automatic top motion is thereat'ter whollyindependent otA the thread, and hence the thread is not broken nor itstension interfered with in order lo secure an operation ol' the stopmotion.

A spring 99 is secured upon a stud 10() on collar 5 which is adjustableon the trip shaft, one end of this spring being arranged in t'ront oione of the tubular supports 7 and the opposite end in front ot' thetubular support 15 ot' the sensitive thread guide. ln the operation ofthe sensitive thread guide alone, this spring acts to return said guideto an operative relation to the remaining thread guides.

Claims:

1. A stop member for thread using machines, a separate continuouslyoperated power element, manually operable starting means, a connectorbetween said starting means and stop element to actuate the stop elementto release position in the movement oi' the starting means, a lever foroperating the connector, and means carried by said lever and actuated bya defect in the thread of the machine to cause lever to be operated bythe separate continuously operated power element to move the connectorto release the stop means.

2. A stop means for thread using machines, a manually operable startingmeans. a movable connector between said means, a lever .secured to saidconnector, a power driven toothed disc, a pawl carried by said lever tocooperate with said disc, and means controlled by a thread defect tormoving said pawl into cooperation with said disc.

Si. A stop means Vfor thread usingmachines, a manually operable startingmeans` a movable connector between said means, a lever secured to saidconnector, a power driven toothed disc, a pawl carried by said lever tocooperate with said disc, a lever operated by a defect in the thread,and a connection between said lever and pawl to operate the pawl in then'iovement of the trip lever, said connection freeing the lever forfurther movement in the thread feeding direction to release the threadobstruction.

4. A stop means tor thread using inachines. a uranually operablestarting means, a movable connector between said means, a lever securedto said connector, a power driven toothed disc. a pawl carried by saidlever to cooperate with said disc, a lever operated by a detect in thethread, and a connection between said lever and pawl to operate the pawlin the movement of the lever, and means to disconnect the pawl from thedisc tolhiwing a predetermined movement o l' said lever.

5. A stop means t'or thread using` machines, a manually operable starting` means. a movable connector between said means, a lever securedto said connector, a power driven toothed disc, a pawl carried by saidlever to cooperate with said disc, a lever operated by a del'ect in thethread, and a connection between said lever and pawl to operate the pawlin the movement of the lever, and means to return said connector tonormal position.

6. A stop means for thread using machines, a manually operable startingmeans. a. movable connector between said means. a lever secured to saidconnector, a power driven toothed disc, a pawl carried by said lever tocooperate with said disc, a tripping mechanism operated by a defect inthe thread, and a connection between said tripping mechanism and pawl tooperate the pawl in the movement oi' said mechanism. means to returnsaid mechanism to normal position, and an adiustable step to limit thenormal position of the lever.

7. In a multi-thread using machine, an automatically operable stopmotion, manually operable means for controlling the stop motion. andmechanism whereby the stop motion is released from the manually operablemeans for automatic actuation by the imperfection of a thread, saidmecha- .llo

titl

nism including a plurality of thread guides movable to set saidmechanism in operation when an imperfection in any of the threads insaid guides is presented to a guide, one of said guides being moresensitive than the others.

8. In a multi-thread using machine, an automatically operable stopmotion, manually operable means for controlling the 2 stop motion, andmechanism whereby the stop motion is released from the manually operablemeans for automatic actuation by the imperfection of a thread, saidmechanism including a shaft, a plural thread guide secured on the shaft,an independent thread guide mounted for free movement on the shaft, anda connection whereby movement of the plural thread guide operates theindependent thread guide.

9. In a multi-thread using machine, an automatically operable stopmotion, manually operable means for controlling the stop motion, andmechanism whereby the stop motion is released from the manually operablemeans for automatic actuation by the imperfection of a thread, saidmechanism including a tripping means operated by gravity to inauguratethe stop motion release, a latch for holding the trip mechanism againstthe iniuence of gravity, a multiple thread guide normally engaging saidlatch, and means to permit movement of the guide to release the latch inthe attempt of an imperfection in the thread to pass through sai guide.

10. In a multi-thread using machine, an automatically operable stopmotion, manually operable means for controlling the stop motion, andmechanism whereby the stop motion is released from the manually operablemeans for automatic actuation by the imperfection of a thread, saidmechanism including a thread guide shaft, a plural thread guide fixed onsaid shaft, an independent guide Inounted on said shaft, a connectionwhereby movement of the plural thread guide operates the. independentthread guide, a tripping mechanism to inaugurate the stop motionrelease, and a latch cooperating with the independent thread guide tohold the tripping mechanism from operative movement under normalconditions.

11. ln a multi-thread using machine, an automatically operable stopmotion, manually operable means for controlling the stop motion, andmechanism whereby the stop motion is released from the manually operablemeans for automatic actuation by the imperfection of a thread, saidmechanism including a plurality of thread guides, a trip mechanismreleased in the thread operation of any of said guides to inaugurate thestop motion release, said manually operable means being movable toregain control of the stop motion following the automatic actuation ofthe latter, and means whereby said movement of the manually operablemeans automatically resets the tripping mechanism in normal relation tothe thread guides.

12. ln a stop motion for automatically stopping when a defect in theused thread contacts with a detector, tripping means controlled by thedetector to stop the thread using mechanism, means for restoring thetripping means to operative position by motion in one direction, aseparate means for holding the tripping means in operative position,means for moving the restoring means from the path of the tripping meansby a reverse motion of said restoring means, said reverse motionpositioning the tripping means to permit continued operation of thethread mechanism.

3. A trip mechanism including an upright, a shaft supported thereon, aseries of thread detecting means arranged on said shaft, an operating`trip element supported for movement lengthwise the upright, and a latchcarried by said element and cooperating with one of said members to holdthe trip element against movement.

14. A trip mechanism including an upright, a shaft supporte-d thereon, aseries of thread detecting means arranged on said shaft, an operatingtrip element supported for movement lengthwise the upright, and a latchcarried by said element and cooperating with one of said members to holdthe trip element against moven'ient, said latch being released bymovement of any of said members under a thread defect.

15, A trip mechanism including an upright, a shaft supported thereon, aseries of thread detecting means arranged on said shaft, an operatingtrip element supported for movement lengthwise the upright, and a latchcarried by said element and cooperating with one of said members to holdthe trip element against movement, said latch being released by movementof any of said members under a thread defect, and manually operablemeans for moving the element to position the latch in cooperation withsaid member.

16. A trip mechanism including a movable element adapted at one limit ofmovement to operate control means, a latch for holding the elementagainst movement, and thread detector mechanism serving when operated torelease the latch, said detector mechanism including a plurality ofthread receiving elements to be actuated by thread imperfection, one ofsaid elements controlling the latch, the others of said elementscontrolling the latch through the first mentioned element.

17. A trip mechanism including a movable element adapted at one limit ofmovement to operate control means, a latch for holding the elementagainst movement,` and llo thread detector mechanism serving when operated to release the latch, said mechanisni including a threadimperfection detector di rectliv cooperating with the latch` and anadditional thread imperfection detector indirectl;y coope 'ating withthe latch.

18. A trip mechanism including' a mor able element adapted at one limitot more nient to operate control means. a latch tor holding' the elementagainst movement, and thread 'letector iiieelnxliism :serving when onerated to release the latch` Said mechanism including?y a plnralitj; ol'thread impert'ei tion detector elements, and means to render one ol'`said thread imi'vertection detectin ;T elements more sen, 'fre to thread'iinpeil'eiAA tion in latch control than the others.

19. trip mechanism including` a n1o\v4 ahle element adapted at one limitot movement to operate control mean, a latch l'or holding the elementaggaiirft inox'ennent. and thread detector mechaniean serving' wheneperated to release the latch. :aid niemianir'mi including a threadimperfection detector adapted i'or swingingT movement nader :i threadimperfection. and means carried Said detector to engage and support thelatch when the detector is in normal position and release, the latchwhen the detector is in operative position, and additional threadimperfection detectors serving when operated to actnatc the tiretmentioned detector and therebyv release the latch.

20. A trip mechanieni including;v a movahle element adapted at one limitot more ment to operate con rol lucana. a latch tor holding' the elementaga t lilou-nient. and thread detector mechai :ii serving when oil;-erated to relea; c the `..tcln said meciiffnisni including' a threadimperl'ection detector directly ff'ontrolling the latch. and a secondthread iiniau'i'ectimi detector adapted in oierrtion to engage andoperate the tiret mentionetl detector to tl'iertfrl)v control the latch.

2l, trip mech/.i m inclml'ng' a mov zahle element adapteri at one, limitoil more ment to oli/crate control meana, a latch for holdingl theelement :xeainr-t movement. and thread detecta nel hrzniam ywerving`when operated to releape the hteh vid niechaniszm includingl a threadiingierfeeti-.n detector diR rectljiv controlling' the latch. andanother thre; d imperiectimi detector haring; a roll adapted inoperation to. engage Sait lirst mentioned detector to therein' actualethe latch.

ln testimoni' whe t ly l ilix my signature.

